mirror of
https://github.com/espressif/binutils-gdb.git
synced 2025-12-19 01:19:41 +08:00
e4e20d4511
Right now, gdbsupport/common-regcache.h contains two abstractons for a regcache. An opaque type `regcache` (gdb and gdbserver both have their own regcache that is the concrete version of this) and an abstract base class `reg_buffer_common`, that is the base of regcaches on both sides. These abstractions allow code to be written for both gdb and gdbserver, for instance in the gdb/arch sub-directory. However, having two different abstractions is impractical. If some common code has a regcache, and wants to use an operation defined on reg_buffer_common, it can't. It would be better to have just one. Change all instances of `regcache *` in gdbsupport/common-regcache.h to be `reg_buffer_common *`, then fix fallouts. Implementations in gdb and gdbserver now need to down-cast (using gdb::checked_static_cast) from reg_buffer_common to their concrete regcache type. Some of them could be avoided by changing free functions (like regcache_register_size) to be virtual methods on reg_buffer_common. I tried it, it seems to work, but I did not include it in this series to avoid adding unnecessary changes. Change-Id: Ia5503adb6b5509a0f4604bd2a68b4642cc5283fd Reviewed-by: John Baldwin <jhb@FreeBSD.org>
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/* Cache and manage the values of registers
|
|
|
|
Copyright (C) 2014-2023 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef COMMON_COMMON_REGCACHE_H
|
|
#define COMMON_COMMON_REGCACHE_H
|
|
|
|
struct reg_buffer_common;
|
|
|
|
/* This header is a stopgap until we have an independent regcache. */
|
|
|
|
enum register_status : signed char
|
|
{
|
|
/* The register value is not in the cache, and we don't know yet
|
|
whether it's available in the target (or traceframe). */
|
|
REG_UNKNOWN = 0,
|
|
|
|
/* The register value is valid and cached. */
|
|
REG_VALID = 1,
|
|
|
|
/* The register value is unavailable. E.g., we're inspecting a
|
|
traceframe, and this register wasn't collected. Note that this
|
|
is different a different "unavailable" from saying the register
|
|
does not exist in the target's architecture --- in that case,
|
|
the target should have given us a target description that does
|
|
not include the register in the first place. */
|
|
REG_UNAVAILABLE = -1
|
|
};
|
|
|
|
/* Return a pointer to the register cache associated with the
|
|
thread specified by PTID. This function must be provided by
|
|
the client. */
|
|
|
|
extern reg_buffer_common *get_thread_regcache_for_ptid (ptid_t ptid);
|
|
|
|
/* Return the size of register numbered N in REGCACHE. This function
|
|
must be provided by the client. */
|
|
|
|
extern int regcache_register_size (const reg_buffer_common *regcache, int n);
|
|
|
|
/* Read the PC register. This function must be provided by the
|
|
client. */
|
|
|
|
extern CORE_ADDR regcache_read_pc (reg_buffer_common *regcache);
|
|
|
|
/* Read the PC register. If PC cannot be read, return 0.
|
|
This is a wrapper around 'regcache_read_pc'. */
|
|
|
|
extern CORE_ADDR regcache_read_pc_protected (reg_buffer_common *regcache);
|
|
|
|
/* Read a raw register into a unsigned integer. */
|
|
extern enum register_status
|
|
regcache_raw_read_unsigned (reg_buffer_common *regcache, int regnum,
|
|
ULONGEST *val);
|
|
|
|
ULONGEST regcache_raw_get_unsigned (reg_buffer_common *regcache, int regnum);
|
|
|
|
struct reg_buffer_common
|
|
{
|
|
virtual ~reg_buffer_common () = default;
|
|
|
|
/* Get the availability status of the value of register REGNUM in this
|
|
buffer. */
|
|
virtual register_status get_register_status (int regnum) const = 0;
|
|
|
|
/* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */
|
|
virtual void raw_supply (int regnum, const void *buf) = 0;
|
|
|
|
/* Collect register REGNUM from REGCACHE and store its contents in BUF. */
|
|
virtual void raw_collect (int regnum, void *buf) const = 0;
|
|
|
|
/* Compare the contents of the register stored in the regcache (ignoring the
|
|
first OFFSET bytes) to the contents of BUF (without any offset). Returns
|
|
true if the same. */
|
|
virtual bool raw_compare (int regnum, const void *buf, int offset) const = 0;
|
|
};
|
|
|
|
#endif /* COMMON_COMMON_REGCACHE_H */
|